<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="../js/vue.js"></script>
    <title>绑定样式</title>
    <style>
        .basic {
            width: 400px;
            height: 100px;
            border: 1px solid black;
        }

        .happy {
            background-color: pink;
        }

        .sad {
            background-color: greenyellow;
        }

        .normal {
            background-color: cornsilk;
        }

        .rainbear1 {
            background-color: plum;
        }

        .rainbear2 {
            font-size: x-large;
            text-shadow: 2px 2px 10px skyblue;
        }

        .rainbear3 {
            border-radius: 20px;
        }
    </style>
</head>

<body>
    <div id="root">
        <!-- 绑定class样式--字符串写法，适用于：样式的类名不确定，需要动态指定 -->
        <div class="basic" :class="mood" @click="changeMood">{{name}}</div><br><br>
        <!-- 绑定class样式--数组写法，适用于：要绑定的样式个数不确定、名字也不确定 -->
        <div class="basic" :class="arr">{{name}}</div><br><br>
        <!-- 绑定class样式--对象写法，适用于：要绑定的样式的个数确定，名字也确定，但要动态决定用不用 -->
        <div class="basic" :class="obj">{{name}}</div><br><br>
        <!-- 绑定style样式--对象写法 -->
        <div class="basic" :style="styleObj">{{name}}</div><br><br>
        <!-- 绑定style样式--数组写法 -->
        <div class="basic" :style="styleArr">{{name}}</div><br><br>

    </div>
    <script>
        Vue.config.productionTip = false

        new Vue({
            el: '#root',
            data: {
                name: 'rainbear',
                mood: 'normal',
                arr: ['rainbear1', 'rainbear2', 'rainbear3'],
                obj: {
                    rainbear1: true,
                    rainbear2: true,
                },
                styleObj: {
                    fontSize: '40px',
                    color: 'red'
                },
                styleArr: [{
                        fontSize: '40px',
                        color: 'red'
                    },
                    {
                        backgroundColor: 'grey'
                    }
                ],
            },
            methods: {
                changeMood() {
                    const arr = ['happy', 'sad', 'normal']
                    this.mood = arr[Math.floor(Math.random() * 3)]
                }
            },
        })
    </script>
</body>

</html>